(Assuming you are on Mac)
There are no plans currently to add an option to disable Play in the Editor, sorry.
You can use the arrows on your keyboard to move around if this relates to you having to do a mouse click (/double-click) in a particular space for edits.

System Prefs>Accessibility>Display shows a number of display options.
Invert colors might help for example. (This might help with other 'dark' apps you use on your Mac also).
You will see the Library, Playlist and Song title windows lighten, and you can change the chart background and Text color in iReal Pro's Preferences>General if you need to (to 'invert' it back to normal black on white background).